Musical aliens have been among us since 2009. That's when the spaceship carrying the itinerant citizens of planet Voca crash-landed in California.

As with the purported UFO incident at Roswell, N.M., back in 1947, researchers, journalists and conspiracy buffs are still trying to sort out the truth of it all. But for now, audiences around the globe are delighting in the sonic experience provided by the Voca People, who touch down at Proctors in Schenectady on Saturday night.

According to Shai Fishman, a Hollywood composer and arranger, word first got out about the Voca People through You Tube. After a single video clip received more than 1 million hits, the only thing left to do was put together a world tour.

As their ambassadors to earthlings, the Voca People rely on Lior Kalfo as producer and artistic director and Fishman as music director. Currently, there are octets of Voca People performing in the U.S., France, Russia, Germany and Japan. (It must have been a very large spaceship to have carried them all.)

"We were big fans of a capella singing for years, but wondered how to create a show that's literally out of this world," says Fishman. "Now we have friendly aliens performing in a quirky, funny way."

Fishman explains that, for Voca People, music is both language and life force. Every sound in their show is produced from their mouths. "You'll hear the sounds of trumpets, violins, drums, percussion, guitars, bass and sound effects like engines, birds, and the wind," says Fishman.

The Voca People have also been quick to embrace the musical tastes of humans.

"We've aimed to create a musical roller coaster of songs we all know, going for the most well known to some that are international and exotic," continues Fishman. "They sing Mozart and Bach, Freddie Mercury and Lady Gaga, Madonna and Michael Jackson and much more. There are bits of about 70 songs in every show."

More than merely offering a concert, the Voca People also tell something of their own story — though only through music — and also interact with the audience.

"Not being able to communicate with words, the Voca People do worry. But there is a plot and you get to know characters," says Fishman. "And they're very exploratory. They love to mingle."